diff --git a/script-resources/markdown2htmldoc/package.json b/script-resources/markdown2htmldoc/package.json
index b07d714..b75246c 100644
--- a/script-resources/markdown2htmldoc/package.json
+++ b/script-resources/markdown2htmldoc/package.json
@@ -7,7 +7,7 @@
     "markdown-it": "*",
     "markdown-it-emoji": "*",
     "markdown-it-task-checkbox": "*",
-    "prismjs": "^1.17.1"
+    "prismjs": "^1.21.0"
   },
   "devDependencies": {
     "eslint": "*",
diff --git a/script-resources/markdown2htmldoc/yarn.lock b/script-resources/markdown2htmldoc/yarn.lock
index 3f491ba..15a0ead 100644
--- a/script-resources/markdown2htmldoc/yarn.lock
+++ b/script-resources/markdown2htmldoc/yarn.lock
@@ -897,10 +897,10 @@ prettier@*:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.0.3.tgz#9a06f0e94a51420e78b6925568b5bec72afe41ea"
   integrity sha512-5qpBDBHO9fpE0zruKiTZm8Gxmz7kknO+WlQR/ivV+RMwgDw/WjOgmxLDn66MPrxq/WZPx/EgEZzh87xJO5E6Fw==
 
-prismjs@^1.17.1:
-  version "1.20.0"
-  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.20.0.tgz#9b685fc480a3514ee7198eac6a3bf5024319ff03"
-  integrity sha512-AEDjSrVNkynnw6A+B1DsFkd6AVdTnp+/WoUixFRULlCLZVRZlVQMVWio/16jv7G1FscUxQxOQhWwApgbnxr6kQ==
+prismjs@^1.21.0:
+  version "1.21.0"
+  resolved "https://registry.yarnpkg.com/prismjs/-/prismjs-1.21.0.tgz#36c086ec36b45319ec4218ee164c110f9fc015a3"
+  integrity sha512-uGdSIu1nk3kej2iZsLyDoJ7e9bnPzIgY0naW/HdknGj61zScaprVEVGHrPoXqI+M9sP0NDnTK2jpkvmldpuqDw==
   optionalDependencies:
     clipboard "^2.0.0"